Transformer is one kind of device that used electromagnetic induction to change AC voltage. The main components are the primary coil, the secondary coil and the core. The main functions are voltage conversion, current conversion, impedance conversion, isolation and so on.
There are many types of transformers, according to the purpose can be divided into power transformers and special transformers. According to the cooling method can be divided into dry-type transformers, oil-immersed transformers. Can also be divided into single-phase transformers(for single-phase load and three-phase transformer group) and three-phase transformer (for three-phase system of the rise and fall voltage).
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